US2897451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multifrequency devices and systems associated therewith
Assignee: Individual
•
Filing: 1958-02-27
•
Granted: 1959-07-28
•
Expires: 1978-02-27
Abstract
No abstract record available.
Inventors
- 👤 Robert B Hammett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:42
CPC Classifications
H; H03; H03B; H03B7/00; H03B7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1446752A
Cited
US1604140A
Cited
US1980912A
Cited
US2067365A
Cited
US2112267A
Cited
US2288486A
Cited
FR896865A
Cited
US2798953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |